Briefly describe the basic process of engine electronic control system troubleshooting.

The basic process is as follows:

(1) Ask the user about the situation in which the malfunction appeared, the conditions under which it occurred, the phenomenon of the malfunction, and whether or not it has been overhauled.

(2) Judge and check whether there is a mechanical failure, if it is a mechanical failure to carry out step (3), otherwise go to step (4); mechanical failure to repair.

(3) Verify whether the fault phenomenon disappears after the mechanical fault is removed, if it disappears, end the inspection.

(4) Read the fault code and verify whether the fault code exists, if it exists, if not, continue the inspection.

Extended information:

Common faults of automotive electronically controlled engines:

(a) Line faults: In the entire engine operating system, the wires are responsible for the connectivity of the various systems such as actuators, sensors and the ECU. ECU between these three is by the role of the wire to complete the task of connecting, if the wire has any failure, then it will certainly affect the three signal transmission and connection work, but also affects the actuator's signal reception.

(ii) component aging or performance degradation: for the car's engine, in the operation phase of the time cycle is longer, and the environment temperature is quite high, which for the integrity of the electronic components, the damage is greater, long time in the high temperature of the working environment, the electronic components are prone to degradation and aging of the phenomenon, which affects the electronic components in the use of the effect.

(3) component breakdown: In general, if the electronic component breakdown occurs, it will affect the line short circuit.